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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4fb98f2dd54b503ecad5013df298a632efcfe194cab9acc12324e94641c925a' 
  AND token = 'y3KNaWeGhdSw8F/POq5cRKZpl+cXbxAX/QVlY1Jr04E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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