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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27a0c5bb963cf88d15d482791ab7ca419728539dd5565fcd417017db6cc04ecf' 
  AND token = '4P3KTy8cfM/kDvJb9UDc+YOv/EkQ2LTvSEwcuJduIgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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