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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a5bb778d049b17c1e79d5771619065f77c0aa33bd01248cdebf344ecbe37bfa' 
  AND token = 'HzA1QHU/b7Ud2NLb1Livp8m9vVNGzALdjFws2LsFt/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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