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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3efe280aaf2f2693d39f13a266db76799593ea2ebdcd08c29d7a84a89a4fd0a' 
  AND token = 'XNUyEG9brYeL7l4N3+USvqqUJ+FXWsVHnK8yTxXSqxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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