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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '749b0dc5f7ea83a3cfdeb63d4baeb81b251b6543617ee4c5fe5b6b97b4cb40b4' 
  AND token = '4owgk/2HzJxYQ2TM9GCvs5nImCEvlADuc2RmwCTa5fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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