SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef4330432c91e9b1b79921db7b1e70e2945365ae58972c88582cb911543f4883' 
  AND token = 'JtjDvAxrgpA9CIfydwkYpW7XQlXVwGjpqMjDKEdfNkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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