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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdc51a8cece4058d09a4aa5bf877f4fa624417a76541a76728d583915fb54f1e' 
  AND token = 'DWgkuZLyoajHeOZNLJGa7YKW6QGyCeWFjp04cf1I+Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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