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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb4aa73782af34758ba6aba9dfc0a786365741cb10069e876b2b950a9e88fc8' 
  AND token = '6zdJqWr/CLLflrdKE9EdsmNrnB/Ht6i/A8RG/94XgaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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