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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b0b253b2e51c19984eb08e71efef7871f529e2a933e40084c83ba492b48f99f' 
  AND token = 'ziTYYhuB3DdIWKErU9yJM2z6K4f2aX8UBXImOuLmHEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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