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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb5dae2452cdd72f470e78609f5493a92ab15a68efa4b888f224f5b5b74e3abd' 
  AND token = 'Zfn/NRL1MctQ05R0MZriRyboxpGvlW+DPla+XoFMJik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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