SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9cfbf2afd274d5156d3a89517183588e6511e966b29696395230f166986ae2' 
  AND token = 'RfqkoM4zNT8FZVbDHP0BlvOAl0YKJWXQKMXNRTFxgNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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