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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8b3812bcb6c02f07daadbe3c71934b8b3cc77939d1d62b598ed9f3a7ea39b9' 
  AND token = 'WhHYV3HHWolbAqmWdm85tb1+Q8TksPlTrHkMqN1Bldk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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