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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '129b1d132e974bbebe31f29d48f706323810bc2817c6e928411813d9e7c76833' 
  AND token = 'WQ0KEDt5uXKTHc5XSw+5PAZBq7RYCnnkitr4uud7M9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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