SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0e5df0e429af35852ec6bff63599a70de8ea97bfbdd4362958ef454d76e915f' 
  AND token = 'pTjxZKkBx5R6MftsI/3mbCgtrvsigzN98ZR+RU5gQG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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