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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5040ef72cd6a748e823519f513b722babc37eb16e34476526a16e436ebb41f5a' 
  AND token = 'nwT9l16tz1IZE8xhfHVE5b7oLJFlqdvKPye79aFv00g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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