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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a5cd4fdf7d985e69e49c54bf7e40a3914fbd06acdbbcd9195a8cd12cf677e9' 
  AND token = '9KxZSxL7mAv2hP40MQjFJ8wbaCePRwboI5Boi2Syj9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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