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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dba8e6ad4300c8ca9f1cbcb028bfe7b0ce24ace2e7ab47d87151c69b7bf1632' 
  AND token = 'F4kzgn0x0JQ8hSlVaupD9wMh9c9BO8CIRxb5YTwd5TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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