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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0239be2f2fee4816d6f904e33e6950d2ffdee15234d1cf3cb6db4842a47f9ec0' 
  AND token = '5d28UOxjeAX52m7J/+UpTpB6mSxzcMI0wfnylJkGGzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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