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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bafb1334cab1cf126371ac9263ae2ffb32675fda5b9ad298a21db03eee047cb' 
  AND token = 'HTYpewX9cSQg/W1HmeRNZuRGvPWafQSysVJMmHm4XHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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