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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f9c64962ac82217835c0252ff297f1f3da4a3b54f911c03fccbbf9d7e00e94' 
  AND token = 'noJ4M2KzFO347wCObhj9aqwWD6nKNYCbJ5U6MG9WFbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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