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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f7e5735b07cb582c7d5adf130b13f435acb9a0bf1ce52d9dccb7e04e7253d2e' 
  AND token = 'tLKY9FTf5opMI2sc1ca+X/TTH5IyGPWPzuNgAmUhV40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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