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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfa7fe9203cd449fa5f000666ef12b306aed4b824c37454d1ceb72acf143699b' 
  AND token = '7AZHtpThTkTm3EedU31FTDMrIbuzmJHTt2B3OncQ5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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