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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '054a9f8c88d6eaa3e44ad87ace433e70b6b60919bc49eaa963913eb6ee5a4c5a' 
  AND token = 'InFaNC6pSjpXeTDezFahzdzOXSa9ZWEvHY6rBSNYcFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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