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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dd8b206cd3b47ff43a5bd791a06453baa0cbaa5c4b78cad09389f27a6d70a99' 
  AND token = 'mqYUgE8Ho8eDvSnfAYvibUKKo5Xq7DR3bk1h9YCxd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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