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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5b127fd184c6d286b03356e5bae54b0949a077c6b1d7aba7fceb76cd37cfb1e' 
  AND token = 'DgHcZuAmbYnQmpAu/wrEoUZNM8MebeuwgT4nx3mOR9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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