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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6ebed16b48336865bea771ac42aa30087c208703c3d8b9aae8a4ac78fce8c86' 
  AND token = '6VP/RTQBxJjSvupM0CwO84nu1QEAzHnQF7BOMvO0OdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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