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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4891611ed81afa3415790a0f8a3d5878177edd803f135c21014d08c7e815c0ef' 
  AND token = 'VjG3KBfaRWQl/pGwaJFzQ7AsIdpswxy7YDLqXR5HJxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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