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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd4b2fdd5137a282ed170f30f081504ac0e0f9ba3d3671e9194d5f0407280a82' 
  AND token = 'oGQeApYzQL1gfAJyrNxbmQl/1cLA0Y9vfHD9qfBSO78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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