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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99e1617808e1b4ac83e4c875cb31f3315cea53cd0d28e6440a5bbe0dbff76187' 
  AND token = '8voj7ckCjUBEpwNxH3PcSukj7RTWPsLya2K7idJcvMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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