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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b67b701277c0e94bb76cab0b772c4155a012420ac3a696fa10e6e2823bfc3e42' 
  AND token = 'nnTh8WKOYfIgqLZ/xUTYO+MYfs8Eeto3+js7n7rDIps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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