SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b9585b857079962105b5069e83d528021b12fb75167b7484334535e325fd1aa' 
  AND token = 'dozm+6rSNgzFt5gWNYV7SK/+hFf0kdNjHj7/oL47dNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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