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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5d5fbb6cfb4a61df71d35ce09b8cd62127f24a244c7018d41f52e0903abac3a' 
  AND token = 'S/2480XR1A4Pb7ZOsSGzgfGxEWlpsZBvnIWbkudwemw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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