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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6d48c12ca4d4d2c474e6ae67bbf42726a700b7ea5c79b310c039c17e0884f19' 
  AND token = 'O8ku9wJq3WDY8PUmR7uLRdyiCA3G9JUyqB7aNQXNNPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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