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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b5102c78bee03907f07f7d083791c6fd2ce016d6bf92dc90f4b67b4685bba3' 
  AND token = '4S15G9w86aT4eWMHKzfqVznH50wfXdRcUUCjnHEoSoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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