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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da65801e7a467b9aceedfcc9c55a24aaf1ece68d43269770ddccc738121b0987' 
  AND token = 'u0Pka8ChACNttuQW3PkO8RWr1Fpo/Uwsq/w4apjT/N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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