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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4be1da00fd96eee7810c2fc58295821bc148dac692041b55130fb9822d8511d7' 
  AND token = '34lAVjRsAL4XeJCd5t/jHalollaCYQEHujELXMLmcLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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