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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d4411419fe27d4fb5ee0495dcbfcf9b6d76210213608ec557ec288fcc83015' 
  AND token = 'GC18dm3hH2ZHw87dVU0fH4jgV354HzeUmyD1HcJmSyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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