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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e50a1b5a41548f26c7e40bc321757ad517b214a635bdb7f05f41711c041a1b' 
  AND token = 'gZhuLq3bOlqxoO6gYnQ7IeD23vY3QLw23c5QiRDN5ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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