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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ebdc3c0e41bc4bb967b51806bb07fdb614dead1330501eec9d42440f0810fed' 
  AND token = 'Lg2SHLBp8qwZ4s8HWg/Ct/FPSfV8kXN/UhcGyjPU9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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