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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a53069074d7dea2403c9c0a20f50e5fbb8bdfba5f8131e65e5083c40e607ae8' 
  AND token = 'FPG5ZqDYxnhoVUkpfDdKSUF/e288Hbu7sVlQTd+BN0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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