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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '343c75887000ad24cd2ad7eb3cbb4259ae6bd2d30f336f29ca48ce25b91a0e13' 
  AND token = 'd5Luxo05KXeYolX7AYXO87J1pEm3gRsWc7srHcl/Ra4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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