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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b556337d4a31f2af01fdaa67746e03ef26cadf0cd9335d7866c239fc4a6da35' 
  AND token = '+ii7L+Et1vmflHM2bc6AjE1HtYpqfQJxGmwAjLRbwMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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