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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac9c35b553feea33573e488baeea9c01147f81eab6f5d180c82e5ded5810f900' 
  AND token = 'cODkBu95o8jBZfk3VJh57nHzK47MQupHBcvktwdhxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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