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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9645d5772563ccbf2ade15b03117a3f3bbf53a0258bccf210f8dff20f5dcbeb2' 
  AND token = '/Pk0TuYTVEfkScs8/wcxVkm8qyLW1YTxl7rA0TzqsNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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