Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7e9c1a080171d6debc26b02a02e3068a5a56c39caee8bd6fe27bf9c02cb66e3' 
  AND token = 'S0grbQrSizXZsz2ImtjFshDqcu5tUaEuIQNLtBsc5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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