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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '840016a968c73d756c5b0210e8ccecc76453a26ded9fbc2a57f47318be762354' 
  AND token = 'bqlRYIT9UHY3ZcF1rUELgTMd3OuOzrj7fol0lPpNjig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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