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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0cba8b4ee9557e4e889ab045e0fdfe98c9fd0db2a37b948f1cfd723b067d719' 
  AND token = 'wbpU0iEvILfAJ7Oa1fXPyc42qH4A+/hI0kFaG9kUVnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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