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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7aae60e7f67d95b3d1f78e119a47f60b4c685104deff9ad07668cf447577f6' 
  AND token = 'Sgh35svghgBw7RfD+A/1yhkIH3y6CvJ851kOu1wK+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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