SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '905e7b448c715856235bd3848c23b51ad22ce8e92bb7fe57fbb801a72c6f8013' 
  AND token = 'Y4V/HHankqQl56bfZvi3jaKWI7CzypBt2YFLd7Kwmo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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