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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dad558d43da621f43ed22d14ce021ab82925f5409ce3743ff22aff1cfa2dc832' 
  AND token = 'kP4WHa0P/LtDtvHo1jg+dvXQViBnJh5oFR4qtxSR8go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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