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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0027e5c626a9690a46908a55b640909fd94f32fabeb769a10eb5576acbdbcbf5' 
  AND token = 'LaSt1vcofEIEmn6W1exB71fZwOGU7a0SGsk1VPuI2Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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