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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26ee2627a947f75b4b239a4f792a4da92ffeefbb66c3564f76e70490b1ec509c' 
  AND token = 'tVfYCxcsJSaqepZo2I00EVLZOFvEeT/wxku7OGL/mN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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