SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c6118c2371006293fee79dc01437d5fae3ad3182e1beb490eb8fe3bdf75595e' 
  AND token = 'rOQDFso6a3U86nmgiJh0soDTfCHGnnBvQVhv/4GM+bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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