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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c4acef288558ee4e0382648659a85534964e68653f23112075a9100c0507b4' 
  AND token = 'YpYYTxMVF5MHlbEq8qWxd/afUMBLsqHuvHgB9TEuImg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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