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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac9c1147c1c0f3b3ab6c5ca04fa52bc3722bf08044f2d5a0e371816c63256a16' 
  AND token = '7ooCCCzGZe21B5C1sx01fZmfyPaDU9ymSRh+igsEK70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}