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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0607639ef90b97055b08c5a35e5ac02fa95e5ec57efa7fc6a99154805cab12bd' 
  AND token = 'ZFYSUcjs4DMZ3LbJmC/Z5C7FAb6VbqWGCMUv8m8rdgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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